Mediate Credo checks

What is in this package? For an adopter configuring Credo.

Two advisory checks that find the two ways a query leaves the seam. Mediate.Credo.NoRawSQL flags raw SQL, and Mediate.Credo.UnmediatedRepo flags an Ecto repo without use Mediate.Repo. Add the package to the :dev and :test dependencies and name both checks in .credo.exs. Mediate.Conformance.RepoCase is what proves the seam covers the surface.